diff --git a/cli/flags.rs b/cli/flags.rs
index 95aa341d6a..14ec7cd514 100644
--- a/cli/flags.rs
+++ b/cli/flags.rs
@@ -23,7 +23,7 @@ pub struct DenoFlags {
   pub net_whitelist: Vec<String>,
   pub allow_env: bool,
   pub allow_run: bool,
-  pub allow_high_precision: bool,
+  pub allow_hrtime: bool,
   pub no_prompts: bool,
   pub no_fetch: bool,
   pub v8_flags: Option<Vec<String>>,
@@ -230,9 +230,9 @@ ability to spawn subprocesses.
             .long("allow-run")
             .help("Allow running subprocesses"),
         ).arg(
-          Arg::with_name("allow-high-precision")
-            .long("allow-high-precision")
-            .help("Allow high precision time measurement"),
+          Arg::with_name("allow-hrtime")
+            .long("allow-hrtime")
+            .help("Allow high resolution time measurement"),
         ).arg(
           Arg::with_name("allow-all")
             .short("A")
@@ -377,8 +377,8 @@ pub fn parse_flags(matches: ArgMatches) -> DenoFlags {
     if run_matches.is_present("allow-run") {
       flags.allow_run = true;
     }
-    if run_matches.is_present("allow-high-precision") {
-      flags.allow_high_precision = true;
+    if run_matches.is_present("allow-hrtime") {
+      flags.allow_hrtime = true;
     }
     if run_matches.is_present("allow-all") {
       flags.allow_read = true;
@@ -387,7 +387,7 @@ pub fn parse_flags(matches: ArgMatches) -> DenoFlags {
       flags.allow_run = true;
       flags.allow_read = true;
       flags.allow_write = true;
-      flags.allow_high_precision = true;
+      flags.allow_hrtime = true;
     }
     if run_matches.is_present("no-prompt") {
       flags.no_prompts = true;
@@ -429,7 +429,7 @@ pub fn flags_from_vec(
       flags.allow_run = true;
       flags.allow_read = true;
       flags.allow_write = true;
-      flags.allow_high_precision = true;
+      flags.allow_hrtime = true;
       let code: &str = eval_match.value_of("code").unwrap();
       argv.extend(vec![code.to_string()]);
       DenoSubcommand::Eval
@@ -487,7 +487,7 @@ pub fn flags_from_vec(
       flags.allow_run = true;
       flags.allow_read = true;
       flags.allow_write = true;
-      flags.allow_high_precision = true;
+      flags.allow_hrtime = true;
       let code: &str = eval_match.value_of("code").unwrap();
       flags.xeval_replvar =
         Some(eval_match.value_of("replvar").unwrap_or("$").to_owned());
@@ -505,7 +505,7 @@ pub fn flags_from_vec(
       flags.allow_run = true;
       flags.allow_read = true;
       flags.allow_write = true;
-      flags.allow_high_precision = true;
+      flags.allow_hrtime = true;
       DenoSubcommand::Repl
     }
   };
@@ -651,7 +651,7 @@ mod tests {
         allow_run: true,
         allow_read: true,
         allow_write: true,
-        allow_high_precision: true,
+        allow_hrtime: true,
         ..DenoFlags::default()
       }
     );
@@ -676,16 +676,12 @@ mod tests {
 
   #[test]
   fn test_flags_from_vec_9() {
-    let (flags, subcommand, argv) = flags_from_vec(svec![
-      "deno",
-      "run",
-      "--allow-high-precision",
-      "script.ts"
-    ]);
+    let (flags, subcommand, argv) =
+      flags_from_vec(svec!["deno", "run", "--allow-hrtime", "script.ts"]);
     assert_eq!(
       flags,
       DenoFlags {
-        allow_high_precision: true,
+        allow_hrtime: true,
         ..DenoFlags::default()
       }
     );
@@ -795,7 +791,7 @@ mod tests {
         allow_run: true,
         allow_read: true,
         allow_write: true,
-        allow_high_precision: true,
+        allow_hrtime: true,
         ..DenoFlags::default()
       }
     );
@@ -814,7 +810,7 @@ mod tests {
         allow_run: true,
         allow_read: true,
         allow_write: true,
-        allow_high_precision: true,
+        allow_hrtime: true,
         ..DenoFlags::default()
       }
     );
@@ -841,7 +837,7 @@ mod tests {
         allow_run: true,
         allow_read: true,
         allow_write: true,
-        allow_high_precision: true,
+        allow_hrtime: true,
         xeval_replvar: Some("val".to_owned()),
         xeval_delim: Some(" ".to_owned()),
         ..DenoFlags::default()
diff --git a/cli/msg.fbs b/cli/msg.fbs
index 9e4bf658e7..08e58351c5 100644
--- a/cli/msg.fbs
+++ b/cli/msg.fbs
@@ -298,7 +298,7 @@ table PermissionsRes {
   write: bool;
   net: bool;
   env: bool;
-  high_precision: bool;
+  hrtime: bool;
 }
 
 // Note this represents The WHOLE header of an http message, not just the key
diff --git a/cli/ops.rs b/cli/ops.rs
index 9b5bc0079e..bd1132fa3a 100644
--- a/cli/ops.rs
+++ b/cli/ops.rs
@@ -261,7 +261,7 @@ fn op_now(
   // If the permission is not enabled
   // Round the nano result on 2 milliseconds
   // see: https://developer.mozilla.org/en-US/docs/Web/API/DOMHighResTimeStamp#Reduced_time_precision
-  if !state.permissions.allows_high_precision() {
+  if !state.permissions.allows_hrtime() {
     subsec_nanos -= subsec_nanos % reduced_time_precision
   }
 
@@ -640,7 +640,7 @@ fn op_permissions(
       write: state.permissions.allows_write(),
       net: state.permissions.allows_net(),
       env: state.permissions.allows_env(),
-      high_precision: state.permissions.allows_high_precision(),
+      hrtime: state.permissions.allows_hrtime(),
     },
   );
   ok_future(serialize_response(
@@ -668,7 +668,7 @@ fn op_revoke_permission(
     "write" => state.permissions.revoke_write(),
     "net" => state.permissions.revoke_net(),
     "env" => state.permissions.revoke_env(),
-    "highPrecision" => state.permissions.revoke_high_precision(),
+    "hrtime" => state.permissions.revoke_hrtime(),
     _ => Ok(()),
   };
   if let Err(e) = result {
diff --git a/cli/permissions.rs b/cli/permissions.rs
index a02c6bb07a..e2e3e22a4d 100644
--- a/cli/permissions.rs
+++ b/cli/permissions.rs
@@ -135,7 +135,7 @@ pub struct DenoPermissions {
   pub net_whitelist: Arc<HashSet<String>>,
   pub allow_env: PermissionAccessor,
   pub allow_run: PermissionAccessor,
-  pub allow_high_precision: PermissionAccessor,
+  pub allow_hrtime: PermissionAccessor,
   pub no_prompts: AtomicBool,
 }
 
@@ -152,9 +152,7 @@ impl DenoPermissions {
       net_whitelist: Arc::new(flags.net_whitelist.iter().cloned().collect()),
       allow_env: PermissionAccessor::from(flags.allow_env),
       allow_run: PermissionAccessor::from(flags.allow_run),
-      allow_high_precision: PermissionAccessor::from(
-        flags.allow_high_precision,
-      ),
+      allow_hrtime: PermissionAccessor::from(flags.allow_hrtime),
       no_prompts: AtomicBool::new(flags.no_prompts),
     }
   }
@@ -350,8 +348,8 @@ impl DenoPermissions {
     self.allow_env.is_allow()
   }
 
-  pub fn allows_high_precision(&self) -> bool {
-    self.allow_high_precision.is_allow()
+  pub fn allows_hrtime(&self) -> bool {
+    self.allow_hrtime.is_allow()
   }
 
   pub fn revoke_run(&self) -> DenoResult<()> {
@@ -378,8 +376,8 @@ impl DenoPermissions {
     self.allow_env.revoke();
     Ok(())
   }
-  pub fn revoke_high_precision(&self) -> DenoResult<()> {
-    self.allow_high_precision.revoke();
+  pub fn revoke_hrtime(&self) -> DenoResult<()> {
+    self.allow_hrtime.revoke();
     Ok(())
   }
 }
diff --git a/js/performance.ts b/js/performance.ts
index 51e213f0f9..602c8018f1 100644
--- a/js/performance.ts
+++ b/js/performance.ts
@@ -5,9 +5,9 @@ import * as flatbuffers from "./flatbuffers";
 import { assert } from "./util";
 
 export class Performance {
-  /** Returns a current time from Deno's start.
-   *  In milliseconds. Flag --allow-high-precision give
-   *  a precise measure.
+  /** Returns a current time from Deno's start in milliseconds.
+   *
+   * Use the flag --allow-hrtime return a precise value.
    *
    *       const t = performance.now();
    *       console.log(`${t} ms since start!`);
diff --git a/js/performance_test.ts b/js/performance_test.ts
index 1238a3836b..ac682364ef 100644
--- a/js/performance_test.ts
+++ b/js/performance_test.ts
@@ -1,7 +1,7 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { testPerm, assert } from "./test_util.ts";
 
-testPerm({ highPrecision: false }, function now(): void {
+testPerm({ hrtime: false }, function now(): void {
   const start = performance.now();
   setTimeout((): void => {
     const end = performance.now();
diff --git a/js/permissions.ts b/js/permissions.ts
index d0885ba6aa..13bcf7f906 100644
--- a/js/permissions.ts
+++ b/js/permissions.ts
@@ -11,7 +11,7 @@ export interface Permissions {
   net: boolean;
   env: boolean;
   run: boolean;
-  highPrecision: boolean;
+  hrtime: boolean;
   // NOTE: Keep in sync with src/permissions.rs
 }
 
@@ -30,7 +30,7 @@ function createPermissions(inner: msg.PermissionsRes): Permissions {
     net: inner.net(),
     env: inner.env(),
     run: inner.run(),
-    highPrecision: inner.highPrecision()
+    hrtime: inner.hrtime()
   };
 }
 
diff --git a/js/permissions_test.ts b/js/permissions_test.ts
index 0a16255e4f..932ec2480a 100644
--- a/js/permissions_test.ts
+++ b/js/permissions_test.ts
@@ -7,7 +7,7 @@ const knownPermissions: Deno.Permission[] = [
   "write",
   "net",
   "env",
-  "highPrecision"
+  "hrtime"
 ];
 
 for (let grant of knownPermissions) {
diff --git a/js/test_util.ts b/js/test_util.ts
index af5dbd2b5f..1b9e2f48c5 100644
--- a/js/test_util.ts
+++ b/js/test_util.ts
@@ -25,7 +25,7 @@ interface TestPermissions {
   net?: boolean;
   env?: boolean;
   run?: boolean;
-  highPrecision?: boolean;
+  hrtime?: boolean;
 }
 
 const processPerms = Deno.permissions();
@@ -51,7 +51,7 @@ function permToString(perms: Deno.Permissions): string {
   const n = perms.net ? 1 : 0;
   const e = perms.env ? 1 : 0;
   const u = perms.run ? 1 : 0;
-  const h = perms.highPrecision ? 1 : 0;
+  const h = perms.hrtime ? 1 : 0;
   return `permR${r}W${w}N${n}E${e}U${u}H${h}`;
 }
 
@@ -69,7 +69,7 @@ function normalizeTestPermissions(perms: TestPermissions): Deno.Permissions {
     net: !!perms.net,
     run: !!perms.run,
     env: !!perms.env,
-    highPrecision: !!perms.highPrecision
+    hrtime: !!perms.hrtime
   };
 }
 
@@ -96,7 +96,7 @@ export function test(fn: testing.TestFunction): void {
       net: false,
       env: false,
       run: false,
-      highPrecision: false
+      hrtime: false
     },
     fn
   );
@@ -152,7 +152,7 @@ test(function permissionsMatches(): void {
         net: false,
         env: false,
         run: false,
-        highPrecision: false
+        hrtime: false
       },
       normalizeTestPermissions({ read: true })
     )
@@ -166,7 +166,7 @@ test(function permissionsMatches(): void {
         net: false,
         env: false,
         run: false,
-        highPrecision: false
+        hrtime: false
       },
       normalizeTestPermissions({})
     )
@@ -180,7 +180,7 @@ test(function permissionsMatches(): void {
         net: true,
         env: true,
         run: true,
-        highPrecision: true
+        hrtime: true
       },
       normalizeTestPermissions({ read: true })
     ),
@@ -195,7 +195,7 @@ test(function permissionsMatches(): void {
         net: true,
         env: false,
         run: false,
-        highPrecision: false
+        hrtime: false
       },
       normalizeTestPermissions({ read: true })
     ),
@@ -210,7 +210,7 @@ test(function permissionsMatches(): void {
         net: true,
         env: true,
         run: true,
-        highPrecision: true
+        hrtime: true
       },
       {
         read: true,
@@ -218,7 +218,7 @@ test(function permissionsMatches(): void {
         net: true,
         env: true,
         run: true,
-        highPrecision: true
+        hrtime: true
       }
     )
   );
diff --git a/tests/025_high_precision.test b/tests/025_high_precision.test
deleted file mode 100644
index fbdbbe8f93..0000000000
--- a/tests/025_high_precision.test
+++ /dev/null
@@ -1,2 +0,0 @@
-args: run --allow-high-precision --reload tests/025_high_precision.ts
-output: tests/025_high_precision.ts.out
diff --git a/tests/025_hrtime.test b/tests/025_hrtime.test
new file mode 100644
index 0000000000..3b25452ac2
--- /dev/null
+++ b/tests/025_hrtime.test
@@ -0,0 +1,2 @@
+args: run --allow-hrtime --reload tests/025_hrtime.ts
+output: tests/025_hrtime.ts.out
diff --git a/tests/025_high_precision.ts b/tests/025_hrtime.ts
similarity index 67%
rename from tests/025_high_precision.ts
rename to tests/025_hrtime.ts
index 85b3c839bf..417ca69821 100644
--- a/tests/025_high_precision.ts
+++ b/tests/025_hrtime.ts
@@ -1,3 +1,3 @@
 console.log(performance.now() % 2 !== 0);
-Deno.revokePermission("highPrecision");
+Deno.revokePermission("hrtime");
 console.log(performance.now() % 2 === 0);
diff --git a/tests/025_high_precision.ts.out b/tests/025_hrtime.ts.out
similarity index 100%
rename from tests/025_high_precision.ts.out
rename to tests/025_hrtime.ts.out