diff --git a/squiggle_more.c b/squiggle_more.c
index eceb37e..247cb74 100644
--- a/squiggle_more.c
+++ b/squiggle_more.c
@@ -275,7 +275,19 @@ void array_print_histogram(double* xs, int n_samples, int n_bins) {
     for (int i = 0; i < n_bins; i++) {
         double bin_start = min_value + i * bin_width;
         double bin_end = bin_start + bin_width;
-        printf("  [%4.1f, %4.1f): ", bin_start, bin_end);
+        if(bin_width < 0.01){
+            printf("  [%4.3f, %4.3f): ", bin_start, bin_end); 
+        } else if(bin_width < 0.1){
+            printf("  [%4.2f, %4.2f): ", bin_start, bin_end); 
+        } else if(bin_width < 1){
+            printf("  [%4.1f, %4.1f): ", bin_start, bin_end); 
+        } else if(bin_width < 10){
+            printf("  [%4.0f, %4.0f): ", bin_start, bin_end); 
+        } else {
+            printf("  [%4f, %4f): ", bin_start, bin_end); 
+        }
+        // number of decimals could depend on the number of bins
+        // or on the size of the smallest bucket
 
         int marks = (int)(bins[i] * scale);
         for (int j = 0; j < marks; j++) {