diff --git a/survey_tools.py b/survey_tools.py
index a5bd806..9803736 100644
--- a/survey_tools.py
+++ b/survey_tools.py
@@ -11,8 +11,8 @@ def call_lastools(tool_name, input, output=None, args=None, verbose=True):
 
     Args:
         tool_name:  name of lastools binary
-        input:     bytes from stdout, or path to main input data
-        output:    '-stdout' to pipe output, or path to main output data
+        input:      bytes from stdout, or path to main input data
+        output:     '-stdout' to pipe output, or path to main output data
         args:       list of additional arguments, formatted for lastools
         verbose:    show all warnings and messages from lastools (boolean)
 
@@ -139,8 +139,8 @@ def update_survey_output(df, output_dir):
     """Update survey profile output csv files with current survey.
 
     Args:
-        df:         dataframe containing current survey elevations
-        output_dir: directory where csv files are saved
+        df:          dataframe containing current survey elevations
+        output_dir:  directory where csv files are saved
 
     Returns:
         None