diff --git a/doc/BOZ analysis part II.1 Small data.ipynb b/doc/BOZ analysis part II.1 Small data.ipynb
index e033edec2f65e353e19ccdf76fd35172e5d1bdc1..8473d8f1ce32e5e9846cec10dc6a23ee171d3858 100644
--- a/doc/BOZ analysis part II.1 Small data.ipynb	
+++ b/doc/BOZ analysis part II.1 Small data.ipynb	
@@ -531,7 +531,7 @@
     "#BAM jitter correction\n",
     "bam = r['BAM1932S'] - r['BAM1932S'].mean()\n",
     "c_ = 299792458 *1e-9 # speed of light in mm/ps\n",
-    "r['delay_ps'] = 0# 2/c_*r['PP800_DelayLine'] - bam\n",
+    "r['delay_ps'] = 2/c_*r['PP800_DelayLine'] - bam\n",
     "# converting back to mm after BAM correction\n",
     "r['delay_mm'] = r['delay_ps']*0.15"
    ]