diff --git a/src/librustc/session/config.rs b/src/librustc/session/config.rs
index 75b758649a63e..2f22f33e39d5c 100644
--- a/src/librustc/session/config.rs
+++ b/src/librustc/session/config.rs
@@ -560,13 +560,13 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
     print_move_fragments: bool = (false, parse_bool,
         "Print out move-fragment data for every fn"),
     flowgraph_print_loans: bool = (false, parse_bool,
-        "Include loan analysis data in --pretty flowgraph output"),
+        "Include loan analysis data in --unpretty flowgraph output"),
     flowgraph_print_moves: bool = (false, parse_bool,
-        "Include move analysis data in --pretty flowgraph output"),
+        "Include move analysis data in --unpretty flowgraph output"),
     flowgraph_print_assigns: bool = (false, parse_bool,
-        "Include assignment analysis data in --pretty flowgraph output"),
+        "Include assignment analysis data in --unpretty flowgraph output"),
     flowgraph_print_all: bool = (false, parse_bool,
-        "Include all dataflow analysis data in --pretty flowgraph output"),
+        "Include all dataflow analysis data in --unpretty flowgraph output"),
     print_region_graph: bool = (false, parse_bool,
          "Prints region inference graph. \
           Use with RUST_REGION_GRAPH=help for more info"),