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-rw-r--r--src/nix-env/help.txt2
-rw-r--r--src/nix-hash/help.txt2
-rw-r--r--src/nix-instantiate/help.txt2
-rw-r--r--src/nix-store/help.txt2
4 files changed, 4 insertions, 4 deletions
diff --git a/src/nix-env/help.txt b/src/nix-env/help.txt
index 72fc4f13ed45..d20c366cb7bf 100644
--- a/src/nix-env/help.txt
+++ b/src/nix-env/help.txt
@@ -1,4 +1,4 @@
-nix-env [OPTIONS...] [ARGUMENTS...]
+Usage: nix-env [OPTIONS...] [ARGUMENTS...]
 
 `nix-env' is a tool to manipulate Nix user environments.
 
diff --git a/src/nix-hash/help.txt b/src/nix-hash/help.txt
index 082cc7571c06..6c166f4995d8 100644
--- a/src/nix-hash/help.txt
+++ b/src/nix-hash/help.txt
@@ -1,4 +1,4 @@
-nix-hash [OPTIONS...] [FILES...]
+Usage: nix-hash [OPTIONS...] [FILES...]
 
 `nix-hash' computes and prints cryptographic hashes for the specified
 files.
diff --git a/src/nix-instantiate/help.txt b/src/nix-instantiate/help.txt
index 5b9d82aa993e..45607b71af00 100644
--- a/src/nix-instantiate/help.txt
+++ b/src/nix-instantiate/help.txt
@@ -1,4 +1,4 @@
-nix-instantiate [OPTIONS...] [FILES...]
+Usage: nix-instantiate [OPTIONS...] [FILES...]
 
 `nix-instantiate' turns Nix expressions into store derivations. 
 
diff --git a/src/nix-store/help.txt b/src/nix-store/help.txt
index 074745813f8a..0e04926af7cd 100644
--- a/src/nix-store/help.txt
+++ b/src/nix-store/help.txt
@@ -1,4 +1,4 @@
-nix-store [OPTIONS...] [ARGUMENTS...]
+Usage: nix-store [OPTIONS...] [ARGUMENTS...]
 
 `nix-store' is a tool to manipulate the Nix store.