diff --git a/.changelog/unreleased/improvements/1087-time-docs.md b/.changelog/unreleased/improvements/1087-time-docs.md
new file mode 100644
index 0000000000..d1e598e473
--- /dev/null
+++ b/.changelog/unreleased/improvements/1087-time-docs.md
@@ -0,0 +1,2 @@
+- Improved the CLI description of the start time node argument.
+  ([#1087](https://github.com/anoma/namada/pull/1087))
\ No newline at end of file
diff --git a/apps/src/lib/cli.rs b/apps/src/lib/cli.rs
index 08d6dfe722..d6d238c859 100644
--- a/apps/src/lib/cli.rs
+++ b/apps/src/lib/cli.rs
@@ -1702,11 +1702,14 @@ pub mod args {
         }
 
         fn def(app: App) -> App {
-            app.arg(
-                NAMADA_START_TIME
-                    .def()
-                    .about("The start time of the ledger."),
-            )
+            app.arg(NAMADA_START_TIME.def().about(
+                "The start time of the ledger. Accepts a relaxed form of \
+                 RFC3339. A space or a 'T' are accepted as the separator \
+                 between the date and time components. Additional spaces are \
+                 allowed between each component.\nAll of these examples are \
+                 equivalent:\n2023-01-20T12:12:12Z\n2023-01-20 \
+                 12:12:12Z\n2023-  01-20T12:  12:12Z",
+            ))
         }
     }