diff --git a/opalt.asciidoc b/opalt.asciidoc
index e1a1f19f2b06e2c0dd2ef61af1da6eb61fb6131f..06314f3971a84b4279df83408a6ce2ae15a093ea 100644
--- a/opalt.asciidoc
+++ b/opalt.asciidoc
@@ -46,10 +46,10 @@ X::
 PX::
   latexmath:[\beta_x\gamma] Horizontal canonical momentum [link:distribution#sec.distribution.unitsdistattributes[Units]].
 Y::
-  Horizontal position latexmath:[y] of a particle relative to the axis
+  Vertical position latexmath:[y] of a particle relative to the axis
   of the element [m].
 PY::
-  latexmath:[\beta_y\gamma] Horizontal canonical momentum [link:distribution#sec.distribution.unitsdistattributes[Units]].
+  latexmath:[\beta_y\gamma] Vertical canonical momentum [link:distribution#sec.distribution.unitsdistattributes[Units]].
 Z::
   Longitudinal position latexmath:[z] of a particle in floor
   co-ordinates [m].
@@ -148,8 +148,8 @@ latexmath:[(X_i, Y_i, Z_i)] and three angles
 latexmath:[(\Theta_i, \Phi_i, \Psi_i)].
 
 latexmath:[\Psi] is the roll angle about the global
-latexmath:[Z]-axis. latexmath:[\Phi] is the pitch angle about the
-global latexmath:[Y]-axis. Lastly, latexmath:[\Theta] is the yaw
+latexmath:[Z]-axis. latexmath:[\Phi] is the yaw angle about the
+global latexmath:[Y]-axis. Lastly, latexmath:[\Theta] is the pitch
 angle about the global latexmath:[X]-axis. All three angles form
 right-handed screws with their corresponding axes. The angles
 (latexmath:[\Theta,\Phi,\Psi]) are the Tait-Bryan angles
@@ -1167,4 +1167,4 @@ anchor:bib.paraview2[[{counter:bib-cnt}\]]
 anchor:bib.visit[[{counter:bib-cnt}\]]
 <<bib.visit>> https://wci.llnl.gov/simulation/computer-codes/visit/[VisIt].
 
-// EOF
\ No newline at end of file
+// EOF