diff --git a/NEWS b/NEWS
index 463b6b62..64388cd3 100644
--- a/NEWS
+++ b/NEWS
@@ -2751,7 +2751,7 @@ New 'G' key binding to trigger mail refresh (G == "Get new mail")
 
   The 'G' key works wherever '=' works. Before refreshing the screen
   it calls an external program that can be used to poll email servers,
-  run notmuch new and setup specific tags for the new emails. The
+  run notmuch new and set up specific tags for the new emails. The
   script to be called should be configured with the "Notmuch Poll
   Script" setting in the customize interface. This script will
   typically invoke "notmuch new" and then perhaps several "notmuch
diff --git a/lib/database.cc b/lib/database.cc
index cffab62c..78a24f7e 100644
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -1336,7 +1336,7 @@ notmuch_database_upgrade (notmuch_database_t *notmuch,
 	return NOTMUCH_STATUS_SUCCESS;
 
     if (progress_notify) {
-	/* Setup our handler for SIGALRM */
+	/* Set up our handler for SIGALRM */
 	memset (&action, 0, sizeof (struct sigaction));
 	action.sa_handler = handle_sigalrm;
 	sigemptyset (&action.sa_mask);
diff --git a/notmuch-insert.c b/notmuch-insert.c
index 90fe3bad..41a11443 100644
--- a/notmuch-insert.c
+++ b/notmuch-insert.c
@@ -521,7 +521,7 @@ notmuch_insert_command (notmuch_config_t *config, int argc, char *argv[])
 	    return EXIT_FAILURE;
     }
 
-    /* Setup our handler for SIGINT. We do not set SA_RESTART so that copying
+    /* Set up our handler for SIGINT. We do not set SA_RESTART so that copying
      * from standard input may be interrupted. */
     memset (&action, 0, sizeof (struct sigaction));
     action.sa_handler = handle_sigint;
diff --git a/notmuch-new.c b/notmuch-new.c
index e6c283eb..5ac7eedf 100644
--- a/notmuch-new.c
+++ b/notmuch-new.c
@@ -662,7 +662,7 @@ setup_progress_printing_timer (void)
     struct sigaction action;
     struct itimerval timerval;
 
-    /* Setup our handler for SIGALRM */
+    /* Set up our handler for SIGALRM */
     memset (&action, 0, sizeof (struct sigaction));
     action.sa_handler = handle_sigalrm;
     sigemptyset (&action.sa_mask);
@@ -1047,7 +1047,7 @@ notmuch_new_command (notmuch_config_t *config, int argc, char *argv[])
     if (notmuch == NULL)
 	return EXIT_FAILURE;
 
-    /* Setup our handler for SIGINT. We do this after having
+    /* Set up our handler for SIGINT. We do this after having
      * potentially done a database upgrade we this interrupt handler
      * won't support. */
     memset (&action, 0, sizeof (struct sigaction));
diff --git a/notmuch-tag.c b/notmuch-tag.c
index 5b2f1e48..2c6e442a 100644
--- a/notmuch-tag.c
+++ b/notmuch-tag.c
@@ -195,7 +195,7 @@ notmuch_tag_command (notmuch_config_t *config, int argc, char *argv[])
     int opt_index;
     int ret;
 
-    /* Setup our handler for SIGINT */
+    /* Set up our handler for SIGINT */
     memset (&action, 0, sizeof (struct sigaction));
     action.sa_handler = handle_sigint;
     sigemptyset (&action.sa_mask);
diff --git a/notmuch.c b/notmuch.c
index a5b2877a..e5c2aeb3 100644
--- a/notmuch.c
+++ b/notmuch.c
@@ -47,7 +47,7 @@ static command_t commands[] = {
     { NULL, notmuch_command, TRUE,
       "Notmuch main command." },
     { "setup", notmuch_setup_command, TRUE,
-      "Interactively setup notmuch for first use." },
+      "Interactively set up notmuch for first use." },
     { "new", notmuch_new_command, FALSE,
       "Find and import new messages to the notmuch database." },
     { "insert", notmuch_insert_command, FALSE,
diff --git a/performance-test/perf-test-lib.sh b/performance-test/perf-test-lib.sh
index 75e3d878..88601fc7 100644
--- a/performance-test/perf-test-lib.sh
+++ b/performance-test/perf-test-lib.sh
@@ -203,7 +203,7 @@ time_done ()
     fi
 }
 
-cd -P "$test" || error "Cannot setup test environment"
+cd -P "$test" || error "Cannot set up test environment"
 test_failure=0
 test_count=0
 
diff --git a/test/test-lib.sh b/test/test-lib.sh
index 486d1c43..23085e74 100644
--- a/test/test-lib.sh
+++ b/test/test-lib.sh
@@ -1231,7 +1231,7 @@ emacs_generate_script
 
 # Use -P to resolve symlinks in our working directory so that the cwd
 # in subprocesses like git equals our $PWD (for pathname comparisons).
-cd -P "$test" || error "Cannot setup test environment"
+cd -P "$test" || error "Cannot set up test environment"
 
 if test "$verbose" = "t"
 then